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- /*
- * crc32.h
- * See linux/lib/crc32.c for license and changes
- */
- #ifndef _LINUX_CRC32_H
- #define _LINUX_CRC32_H
- #include <linux/types.h>
- #include <linux/bitrev.h>
- u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len);
- u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len);
- /**
- * crc32_le_combine - Combine two crc32 check values into one. For two
- * sequences of bytes, seq1 and seq2 with lengths len1
- * and len2, crc32_le() check values were calculated
- * for each, crc1 and crc2.
- *
- * @crc1: crc32 of the first block
- * @crc2: crc32 of the second block
- * @len2: length of the second block
- *
- * Return: The crc32_le() check value of seq1 and seq2 concatenated,
- * requiring only crc1, crc2, and len2. Note: If seq_full denotes
- * the concatenated memory area of seq1 with seq2, and crc_full
- * the crc32_le() value of seq_full, then crc_full ==
- * crc32_le_combine(crc1, crc2, len2) when crc_full was seeded
- * with the same initializer as crc1, and crc2 seed was 0. See
- * also crc32_combine_test().
- */
- u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len);
- static inline u32 crc32_le_combine(u32 crc1, u32 crc2, size_t len2)
- {
- return crc32_le_shift(crc1, len2) ^ crc2;
- }
- u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len);
- /**
- * __crc32c_le_combine - Combine two crc32c check values into one. For two
- * sequences of bytes, seq1 and seq2 with lengths len1
- * and len2, __crc32c_le() check values were calculated
- * for each, crc1 and crc2.
- *
- * @crc1: crc32c of the first block
- * @crc2: crc32c of the second block
- * @len2: length of the second block
- *
- * Return: The __crc32c_le() check value of seq1 and seq2 concatenated,
- * requiring only crc1, crc2, and len2. Note: If seq_full denotes
- * the concatenated memory area of seq1 with seq2, and crc_full
- * the __crc32c_le() value of seq_full, then crc_full ==
- * __crc32c_le_combine(crc1, crc2, len2) when crc_full was
- * seeded with the same initializer as crc1, and crc2 seed
- * was 0. See also crc32c_combine_test().
- */
- u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len);
- static inline u32 __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2)
- {
- return __crc32c_le_shift(crc1, len2) ^ crc2;
- }
- #define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length)
- /*
- * Helpers for hash table generation of ethernet nics:
- *
- * Ethernet sends the least significant bit of a byte first, thus crc32_le
- * is used. The output of crc32_le is bit reversed [most significant bit
- * is in bit nr 0], thus it must be reversed before use. Except for
- * nics that bit swap the result internally...
- */
- #define ether_crc(length, data) bitrev32(crc32_le(~0, data, length))
- #define ether_crc_le(length, data) crc32_le(~0, data, length)
- #endif /* _LINUX_CRC32_H */
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